I'm too tired to look for it, but does it support T-Mobile's 3G frequencies? If not, you'll get 2G data, which isn't good speed, it's not poor speed, it's not speed at all.

 

GSM Arena lists the frequencies for the N7000 as the following:

So if would seem that if you in an area where T-Mobile has refarmed their HSPA to the 1900 band, you should get HSPA/3G. However it doesn't support T-Mobile's main HSPA or LTE frequency which is 1700.